That which every human knows of fear, we, humans have the natural instinct to fear anything from the dark to love itself.
That which every human knows to fear love at some point in life, either from too many heartbreaks or a bad relationship that haunts your very being or both. Or simply the fear of being lonely, going from one relationship to the next without not knowing you truly are and what kind of person you want.
Or the fear of being alone, here is the thing there is a huge difference between being alone and being lonely. Being alone is a decision. Being lonely is a feeling that comes with depression. The fear of being alone is going one companion to the next because misery loves company. In a way I understand those fears because one of these fears are mine. Sometimes the only way to defeat fear is to make new friends or to stop going from relationship to relationship and figure yourself out.